What is the mass/volume percent concentration of the following solutions? a. 0.078 mol KCl in 75 mL of solution b. 0.044 mol sucrose (C₁₂H₂₂ O₁₁) in 380 mL of solution

Verified step by step guidance

1. insert step 1> Calculate the molar mass of the solute (KCl for part a and sucrose for part b) using the periodic table.
2. insert step 2> Convert the moles of solute to grams using the formula: grams = moles × molar mass.
3. insert step 3> Determine the mass/volume percent concentration using the formula: (mass of solute in grams / volume of solution in mL) × 100%.
4. insert step 4> For part a, use the calculated grams of KCl and the given volume of 75 mL to find the percent concentration.
5. insert step 5> For part b, use the calculated grams of sucrose and the given volume of 380 mL to find the percent concentration.

Key Concepts

Mass/Volume Percent Concentration

Mass/volume percent concentration is a way to express the concentration of a solution, calculated as the mass of solute (in grams) divided by the volume of solution (in milliliters), multiplied by 100. This measurement provides a clear understanding of how much solute is present in a given volume of solution, which is essential for various applications in chemistry and biology.

Molarity and Moles

Molarity is a measure of concentration defined as the number of moles of solute per liter of solution. To calculate the mass/volume percent concentration, it is often necessary to convert moles of solute into grams using the molar mass of the solute. Understanding how to relate moles to mass is crucial for accurately determining concentrations in solutions.

Dilution and Solution Preparation

Dilution refers to the process of reducing the concentration of a solute in a solution, typically by adding more solvent. When preparing solutions, it is important to know the final volume and the amount of solute required to achieve the desired concentration. This concept is fundamental in laboratory settings where precise concentrations are necessary for experiments.